March 22 (UPI) -- The Pentagon is investigating leaks of national security information, including using polygraph tests, one day after media reports about an upcoming briefing with White House senior adviser Elon Musk. Joe Kasper, the Defense Department's chief of staff, on Friday issued a memo about the "recent unauthorized disclosures of national security information involving sensitive communications with principals within the Office of the Secretary of Defense demand immediate and thorough investigation." He said the "use of polygraphs in the execution of this investigation will be in accordance with applicable law and policy." Polygraph tests are typically not admissible...